Format menu
Copy Style — Copy the style of the selected text, so that you can apply it elsewhere with the Paste Style command. This uses a special style clipboard, so you don't lose the data in the normal clipboard.
Paste Style — Apply the style in the style clipboard (gotten by using the Copy Style command) to the selected text.
Clear Style — Remove all styling from the selected text, thus reverting it to the default style. This is useful for getting rid of weird styles in notes that you pasted from other applications. Also, if you clear the style from anything other than a note, all items of that type revert to the default style built in to OmniFocus.
Make Default Note Style — Take the style at the beginning of the selected note (or the beginning of the selection, if you've selected one part of a note) and make it the default style for all notes.
Font — This submenu contains standard commands for changing the appearance of the selected text. You can freely style notes, and you can change the application-wide styles for projects, groups, actions, and the specially-styled action types such as next actions or overdue actions.
Text — This submenu contains standard commands for adjusting the alignment and spacing of the selected text, particularly when editing a note.